Peter wrote...

>Squirrel cage shaded pole
>motors are as synchronous as their 2 and 3 phase cousins. Except they are
>usually designed to operate with considerable slip (and this is why they
>usually run hot and have low efficiency).

Synchronous motors have zero slip.  That's why they're called
"synchronous"-- they rotate synchronously with the applied AC voltage.

Common induction motors (squirrel-cage, etc.) have slip, and it's from
this slip that they get their torque; synchronous motors don't have any
slip, and get their torque from the angle by which the rotor's static
magnetic field lags behind the applied AC field.

I think.

Dave

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